Apparatus and method of controlling black stretch

Details Apparatus and method of controlling black stretch Apparatus and method of controlling black stretch

2007-08-14

2011-10-11

Lee, Michael (Department: 2422)

Television

Cathode-ray tube display automatic black level bias control

C348S674000, C348S673000, C348S678000, C348S672000

Reexamination Certificate

active

08035738

ABSTRACT:
An apparatus for controlling black stretch includes a black stretching unit, an offset adjusting unit and an output unit. The black stretching unit performs black stretch processing on a video signal less than or equal to the maximum value of a black stretch control range in response to a slope of black stretch. The slope of black stretch corresponds to a region between a minimum value and a maximum value of the black stretch control range. The offset adjusting unit adjusts an offset of the black-stretched video signal. The output unit outputs an output video signal corresponding to the offset-adjusted video signal when the offset-adjusted video signal has a positive value in a region less than or equal to the minimum value, and outputs the output video signal corresponding to 0 when the offset-adjusted video signal has a negative value in the region less than or equal to the minimum value.

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